In a studio setting, Stephen Hawking, Arthur C. Clarke and Carl Sagan (who joins them via satellite) discuss the Big Bang theory, God, our existence...
How secure is our future? This eye-opening documentary -- which uses computer-generated imagery to illustrate an asteroid collision, black holes and...
The use of embryonic stem cells has ignited fierce debate across the spiritual and political spectrum. But what if we could create manmade stem cells...